Cook stove



Jan, 1.9, 1943. A, G SHERMAN 2,308,570

COOK STOVE Filed April 4. 1940 5 Sheets-Sheet l INVENTOR. /52 V//V 6./VEAMHM Jan. 19, 1943. A, G. SHERMAN COOK s TOVE Filed April 4, 1940 3Sheets-Sheet 2 T N1 NK R Ef O w# T m5 A G.. @w M Patented Jan. 19, 1943Coon sTovE Alvin G. Sherman, Grosse Pointe, Mich., assignor to GlobeAmerican Corporation, Kokomo, Ind.,

a corporation Application April 4, 1940. Serial No. 327,804

10 Claims.

This invention relates to a cook stove. More particularly the inventionrelates to a. novel arrangement of operating parts for the burners andoven controls of a gas cook stove. In stoves of this type it hasheretofore been the general practice to place the burner and ovencontrol elements on the front of the stove immediately beneath thecooking top. In this position the control elements are easily reachedbut it is difcult when working in the ordinary position close to thestove to read thefvarious indices on the control knobs. This isparticularly so in the case of oven controls which must be set todei'lnite temperature and time graduations marked on the control dials.Burner valve handles on the front of the stove are also easily reachedby young children. The danger ofa child tampering with such controlknobs is readily apparent.

In the present invention, all control elements for the entire stove areplaced on the backrail of the stove in position to be reached withoutextending the arm over a cooking burner. In this position all indicesmay be easily read Without backing away from the stove and the burnerknobs are out of reach of young children. i

One object of the invention is to provide an arrangement of elements bywhich the burners may be controlled by elements mounted on the backrail.

Another object of the invention is to arrange the parts in a. series ofassemblies and subassemblies-such as to facilitate large scale man'ufacture and reduce the time and space required in assembling a stove.

Another object of the invention is to arrange the partsy so that theangular position of all of the control knobs for the top burners of thestove may be simultaneously adjusted With respect to the backrail. Thisobject is obtained by a novel arrangement for mounting the burner valveson a gas manifold and by mountingthe manifold in a novel manner on thebackrail.

Another object of the invention is to group the control elements for theoven in a unitary sub-assembly which may be attached as a unit to thebackrail.y

Another object of the invention is generally to simplify the arrangementof control elements for a combined thermal and time control of an oven.

Other objects and features of the invention will be understood from theaccompanying drawings and the following description and claims;

Fig. 1 is a perspective view of the top of a stove constructed inaccordance with the invention .showing the position of the tcp burnersand control elements mounted on the backrail. Fig. 2 is a rear view ofthe stove. Fig. 3 is a similar view on an enlarged scale of a part of 5the apparatus shown in Fig.. 2. Fig. i is a rear view of the backrailitself with the control elements .removed therefrom. Fig. 5 is asectional view taken on the line 5--5 of Fig. 2, the dotted linesindicating the open position of the closures and the correspondingpositions of the directly associated parts. Fig. 6 is a sectional viewtaken on the line 6--6 of Fig. 2. Fig. 7 is a sectional view taken onthe line '|-1 of' Fig. 2. Fig. 8 is a rear view of one of,` the ovencontrol elements with parts removed. Fig. 9 is a plan view with i partsin section taken on the line 9-9 yof Fig. 8. Fig. 10 is a plan view witha part in section of a portion of the time control mechanism for theoven.

illustra ed a preferred form of the invention and referring moreparticularly to Figs. l and 2, there il's shown a pair of side pontoons20 supporting'a cooking top 2|, in turn supporting a backrail 22. Thebackrail is preferably formed integrally with thel cooking top but maybe a separate piece attached thereto if desired. An Toven, the generalposition of which is indicated /by a broken line 23 in Fig. 2, ismounted be- Ineath the cooking top 2| and between the side `pontoons 20.The oven is heated by a burner 24 placed beneath the same.

Air for combustion purposes may enter the oven burner space through anopening 25 (Figs. 2 and 5) in the back plate 26 of the stove. Theopening 25 may be closed by a closure member 2l hinged to the back plateby hinges 28. A vent opening 29 is also provided `in the back plate 26and connects with the interior of the oven through a passage 30 formedin the insulated wall 3| of the oven. The vent opening 29 leads to aflue 32, see Fig. 2, which conducts the gaseous products of combustionto louvres 33, see Fig. l, in the backrail of the stove. The vent 29,see Fig. 5, is closed by a closure member 34. A false louvre 35, seeFig. 1, is mounted on the opposite side of the backrail to provide abalanced appearance. At each side of the cooking top 2| there areprovided top burners 36. A receptacle 3l for deep well cooking isprovided on one side and is heated y'by a similar burner not shown.Between the burners on opposite sides of the stove there is provided aworking space 38. A

Referring now to Fig. 4, there is shown a rear Referring to the drawingsin which there isl view of the backrail and cover plate prior toassembly of control parts thereon. Holes 39 are provided to receivebolts for the attachment of the louvres 33 and 35. A central opening 48is provided opposite which the several control elements are to bemounted. The opening 40 is closed by a cover plate 4|, the shape ofwhich is best seen in Fig. 5 and the extent of which is indicated inFig. 1. The cover plate 4| is spaced forwardly from the backrail 22 andis provided with individual openings 42 for the several controlelements. The cover plate 4| is also provided with a pair of legs 4|a(Fig. 7) engaging the surface of the backrail 22 and receiving bolts 44engaging holes 45 in the backrail for securing the cover plate thereto.

A gas manifold 46 consisting of a horizontal run 41 and a substantiallyvertical run 48 is mounted on the backrail by means shown particularlyin Fig. 5. Studs 49 are welded to the manifold 46 at suitable intervalsand project through holes 50 in the backrail, see Fig. 4. Washers 5|serve to space the manifold from the backrail and nuts 52 threadedlyengaging the studs 49 hold the manifold in piace. Preferably two suchfastenings are provided and are positioned as indicated by the holes 50in Fig. 4. The holes are made slightly larger than the diameter of thestuds 49 so that a limited rocking movement of the manifold is permittedabout a horizontal axis parallel to the manifold until the nuts 52 havebeen tightened. r The ,vertical run 48 of manifold 48 has securedthereto by welding or otherwise, an arm 53. see Figs. 2 and 6,threadedly engaged with an adjusting screw 54 which is secured to thewall of the pontoon by a locknut 55. By loosening the locknut 55 andturning the screw 54 the spacing of the manifold from the wall of thepontoon may be varied. This movement rocks the horizontal run of themanifold and permits it to be placed in a desired angular relationshipwith respect to the backrail. When properly adjusted the nuts 52 and thelocknut 55 may be tightened to retain the manifold in place. The lowerend of the manifold 46 terminates in an elbow 55, see Fig. 2, which maybe connected through a suitable opening 51 with a gas supply main, notshown.

On the underside of the horizontal run 41 of the manifold 46 there aremounted three burner valves 58, see Figs. 2 and 3, connected bydetachabley union ttings to pipes 59 leading to the burners 36. A valve69 is similarly attached to the manifold and has detachably se curedthereto a pipe 6| and a pipe 62 leading respectively to the burner andpilot of the deep well 31. Fittings 63 and 64, see Fig. 2, are securedto the manifold 46 and have detachably connected thereto pipes 65 and 66leading respectively to the pilots of the burners 36 on opposite sidesof the cooking top. Each of the valves 58 and 60 is provided with avalve stem 61 (Fig. 7) projecting through the appropriate opening 42 inthe cover plate 4| and carrying a control knob 43. The control knobs 43,as best seen in Fig. l, are of the proper size and shape to hide theopenings 42 and to hide the heads of the bolts 44 which secure the coverplate 4| to the backrail 22. It willbe apparent that the angularposition of the knobs 43 with respect to the cover plate 4| isdetermined by the angular position of the manifold 46 and this in turnis determined by the adjustment of the screw 54 which retains thedownward run 48 of the manifold. Thus the control knobs 43 may beproperly positioned without the necessity of accurate machine work atany point in the manufacture.

The oven burner 24. see Fig. 2, is supplied with gas by a pipe 68leading from a thermally controlled valve 69 which is in turn connectedto a shutoff valve 10 by a pipe connection 1|. The valve 10 is connectedto the manifold 46 by a pipe connection 12. The pipe 12 is connected ateach end by a detachable union 13 and the pipe 68 is similarly connectedto valve 69 by a similar union 14. The pipe 1| however is permanentlysecured both to the valve 69 and the valve 10. The valve 1li is mountedon a bracket 15 which is in turn secured by a pair of screws 18 (Figs. 8and 9) to the backrail 22. The screws 16 enter the backrail throughholes 11 (Fig, 4).

The shutoivalve 1U, see Fig. 8, is provided with a valve stem 18 havinga contact member 19 adjustably secured to its upper end and guided in abracket 8|) secured to the bracket 15. The contact member 19, see Figs.2 and 3, is engageable by the face 8l of a earn 82 which is mounted on acam stem 83 journaled in a bearing 84, see Fig. 5, secured to thebracket 15 by bolts 85. The cam stem 83 projects forwardly through oneof the openings 42 in the cover plate 4| and carries a control knob 86.A compression spring 81 seated in a recess in the bearing 84 abutsagainst a washer 88 secured to the stern 83 and normally urges the stemand the control knob 86 to the left in Fig. 5. The cam 82 is providedwith ahub 89 having a tongue 90 adapted to seat in a recess 9| inbearing 84. see Fig. 8. So long as the tongue 90 is seated in the recess9|, the cam cannot be turned but when the knob 86 is pressed to theright against spring 81, see Fig. 5, the tongue 90 is freed from therecess 9| and the cam 82 then may be turned for the face 8| to engagewith the contact member 19 and press the same downwardly as the knob andcam are turned clockwise, see Figs. 2 and 3. In the normal position ofthe parts, with the tongue 98 engaged with the recess 9|, the cam is outof contact with the member 19 which is held in its upward position by asuitable spring, not shown, within the structure of the valve 10. Inthis normal position of the parts, the valve 1D is closed. When the knob85 has been pressed inwardly and the cam has been rotated clockwise inFigs. 2 and 3, the cam surface 8| presses the contact member 19 andvalve stem 18 downwardly, as previously described, and opens the valve1D.

The cam 82, see Figs. 2, 3 and 5, is provided with a latching face 92adapted to engage a pin 93, see Figs. 2, 3 and 8, mounted on a latchlever 94 which is pivotally mounted at 95 (Fig. 8) on an arm 96 formedon the bearing 84. A torsion spring 91 maintains the pin 93 in contactwith the face of the cam 82. When the cam 82 has been turned to fullyopen the valve 'l0 the pin 93 engages the latching face 92 and retainsthe cam and valve in the full open position. A vertically disposed bar98, see Figs. 2, 3 and 5, is pivotally connected at its upper end to thecam 82 at 82a and at its lower end has a pin and slot connection 99,see-Figs. 2 and 5 only, with an arm |00 secured to a vertical bar |0|.The bar |0| carries a biasing weight |02, see Fig. 2 only, and ispivotally secured at its lower end to the closure member 21, see Figs. 2and 5, and its upper end is pivotally secured to an arm |03 fastened tothe closure member 34, previously described. By means of theseconnections the `aeoatvo and` itsrconnection to members ||0| so thataxial movement'of member 82 has no eiect -on the two closures 34 .and21. However, when 'i member 82 is rotated, the strap 98 `elevates andmoves upwardly ymembers |00 and |0| as well as the weight |02 (see Fig.2). In this elevational movement.; since closures'34 and 21 are pivoted,members |00 and |'0| must move to the dotted line position shown in Fig.5. In so moving it will `be'observed-that of `necessity when all play inthe connections is exhausted the lowerk portion of the strap 98 yieldsto the dotted line position. When member 82 is repositioned the severalparts assume the position /shown in-Fig. l by full lines. z Note thatdue to the required angling of member 98 the actual elevationalmovementof pivot82a is less than the actual vertical movement of .member |00.Movement of the latch lever 94 about its pivotal mounting 95 to free thepin ,93 from the latching face' 92 permits the biasingrweight |02 tomove the parts to close the air inlet and vent and vreturn the cam 82and knob 86 to normal position, ythus also closing the valve10. f i

A push :button |04 (Fig. 1) is mounted lon a pin |05 (Figs. 8 and 9)vwhich is slidably guided` in an embossment |06 (Fig. 4) inthe coverplate 4 I. The pin |05 is adapted to engage an upturned portion |01 o1 alever |08' which" is pivotally mounted on a pivot 4screw |09 secured toan angley member |0 which isin turn secured to the bracket y and in turnto backrail 22 by the prevlouslyimentioned screws 16. The lever |08 hasav rearwardly projecting portion adapted to engage the' latch lever 94-and is normally held out of engagement with said lever by a tensionspring ||2. By this means pressure on the button |04 moves the lever |08about its pivotal mounting, brings said lever into contact with thelatch lever 94 and then rocks, see dotted lines Fig. 9,v said latchlever upon its pivot 95 to free the pin 93 from the latching face 92because in such movement pin 93 will move to the right in Fig. 2, thusclearing shoulder or face92 of the cam lever 82. Notethe lower endv oflever 94', see Figs.l 2, 3 and 8, moves to the left to af` fect suchrelease. i

A clock ||3, see Fig. 3, is provided with arms ||4 which are securedftothe backrail 22 by suitable bolts engaging openings ||5 (Fig. 4) in saidbackrail. The clock is provided with the usual control stem extendingthrough fone of the openings 42 in the cover plate 4| and carrying anindex knob H6, see Fig. 1. The clock 3 is of a well known type commonlyusedffor oven control and need not be described in detail.' It isprovided with the usual timing train adapted to rotate the knob'l |6 inacounterclockwisedirection and the usual alarm train operated by aseparate spring and adaptedtoturn a stem ||1, see Fig. 3, extendingdownwardly from-the clock at the rear of the back plate 22. In theopera'- tion of the clock mechanism, the knob A1I|6-is manually turnedin a clockwise*drectiona'pre# determined distance andisthenasettofalgraduation, see Fig.1',r indicating a Idefinitefperiod-of time.vr:The-1initialrlmovementwof the i knob k'winds the springs f or thetiming train'xand: alarm -ftrain andpfsets `the :parts-.invr'readinessforuopeiat'ion. Thereafter, the operation of. thetimingtrain-re; turnsthe .knobl ||6to itsfinitial .position duringa openings 4-2 in the coverplate 4|.

period of time corresponding to the graduation at which the knob hasbeenset. At the-end of that time the alarm trainis tripped and the stem ||1is moved rapidly in a clockwise direction (Fig. l0). The'stem ||1hassecured thereto an arm ||8 pivotally connected to a link` H9, seeFigs.

V2, 3 and 10,' secured by an extensible'connection '|20 to a `link |2|which is in turn pivotally connected `to the lower end of the lever 94,see Figs. 2 anda 3 only. By this means the operation of the alarm trainofi the clock trips' the latch lever 94in the same manner as themanual'operation offthe buttonl |04, thatfis, moves lever 94 clockwiseonpivot 95. v

The valve 69 is connectedv by/a tube"|22 with a' thermostat bulb |23(Fig. 2) within the oven 23 and to the vpilot of the ovenburner by a gaspipe |24, see also Fig. 3. Said valve vis'provided witha control knob|25, see Fig.f1,' mounted on a yportion thereof projecting through oneof the The valvevvv 69 is of a well known form adapted tol respond tothe temperature of the oven as indicated by the thermostat-.bulb |23fandto control the flow of gas to the' ovenfburner to prevent arise intemperature abover afpredetermineddegree as indicatedby the settingy ofthe control knob |25. The

valve 169 is supported fromthe valve 10 by the pipe connection 1|,'shown clearly in Fig. 3, and is not connected in any other manner to thebackrail 22 or vtothe cover plate 4|. The valve 69 Athus receivesitsprimary support from the bracket .15' andy may be assembledwith-thevalve 10, the cam 82,'the trip mechanism of the cam bracket 15asay unitary assembly.

and the In the vconstruction of the stove, the manifold 46-41-48-and1the valves 58 and` 60 vtogether with the `iittings 63 and 64 and afittingIZG, see upper right cornerFig. 3, `to which the pipe 12 issecured, Vmay be' assembled 'as' a unitary structure or sub-assembly.Thefvalvje"10,pipe 1|, valve 69 and mechanism associated with the cam 82may be attached to the' bracket 15 as a second unitary sub-assembly.''I'he nal assembly of thestove then'consistsonly of the attachment ofthe clock H3 and the two sub-assemblies just described to thebackrail22, the addition of the several detachable pipe connections. theattachment of the bars 98 and |0| and the attachment of the severalcontrol knobs at the front ol'` the covery plate 4|. In this assemblyoperation the angular position of the manifold 46 may be adjusted asrequired and described and by the screw 54 to insure properpositioningofthe stems supporting theseveralcontrol knobs-and ofthet'- ting |26. Y

The vdivision of labor in the construction of the sub-assemblies and theiinal assembly pro'- motes efficient operation inthe nal 4ass'en'ibly lytothe speed.ofope'rrrtionfo'fiethe inalfass'embly. .The- .simplicity--vofVv construction* ofIV lt-lie control mechanism forthe shutoff valve1'0 iin which? valve andV vents are operated?by'themovement of`Vr asingle' "control m'ember' L(cams 823W islalso an important factorA he edasvasd'eiined by.thelappendedfclaims'. fl

The invention claimed is:

1. In a gas cook stove having a cooking top, burners, and a backrailprojecting upwardly adjacent the rear edge of the cooking top. thecombination of a gas manifold having a horizontal run extending alongthe rear face of said backrail and a substantially vertical runextending downwardly from said horizontal run, burner valves carried bythe horizontal run of said manifold, control members for said burnervalves accessible from the front of said backrail and vconnected to saidvalves through said backrail, means for securing said horizontal run tosaid backrail, said means permitting limited pivotal movement about anaxis parallel to said horizontal run, means for securing said verticalrun to a rear portion of the stove, said means being horizontallyadjustable to adjust the angular position of said manifold, valves andvalve control members with respect to said backrail, and pipeconnections between said valves and said burners.

2. In a gas cook stove having a cooking top, burners, and a backrailprojecting upwardly adjacent the rear edge of the cooking top, thecombination of a gas manifold having a horizontal run adjacent the upperportion of the rear face of said backrail and a substantially verticalrun extending downwardly from one end of said horizontal run, burnervalves carried on the underside of said horizontal run, control membersfor said burner valves accessible from the front of said backrail andconnected to said valves through said backrail, means for securing saidhorizontal run to said 'backraiL said means permitting limited pivotalmovement about an axis parallel to said horizontal run, means forsecuring said vertical run to a rear portion of the stove, said meansbeing horizontally adjustable ,'burners, and a backrail projectingupwardly adjacent the rear edge of the cooking top, the combination of agas manifold having a horizontal run adjacent the upper portion of therear face i of said backrail-and a substantially vertical run horizontalrun, burner 4valves carried on the underside of said horizontal run,said backrail having an opening through which said valves are accessiblefrom the front, a detachable cover plate covering said opening, controlmembers for said burner valves accessible from the front of saidcoverplate and connected to said valves through openings in said coverplate, said control members covering said openings, means for securingsaid horizontal run to said backrail, said means permitting limitedpivotal movement about an' axis parallel to said horizontal run, meansfor securing said vertical run to a rear portion of the stove, saidmeans being horizontally adjustable to adjust the angular position ofsaid manifold, valves and valve control members with respect to saidbackrail, and the position of said control members with respect to theopenings in said cover plate, and' pipe connections between said valvesand said burners.

4. In a gas cook stove, the sub-combination including an oven, a shutovalve having a valve stem biased to shutoff position, a cam having aface engageable with said valve stem to move the same to open positionand having a latching face, a cam stem on which said cam is mounted,biasing means urging said cam toward valve closing position, a latchmember engaging said latching face and normally holding said cam inposition to open said valve, vents for incoming and outgoing air forsaid oven, closures Afor said vents, linkages connecting said cam andsaid closures to hold the same in open position, means on the forwardend of said cam stem accessible from the front of the stove for rotatingthe same to open said valve and vents, and means for tripping said latchmember to close the same.

5. In a gas cook stove, the sub-combination including an oven, a shutoivalve having a Yvalve stem biased to shutoff position, a cam having aface engageable with said valve stem to' move the same to open positionand having a. latching face, a cam stem on which said cam is mounted,biasing means urging said cam toward valve closing position, a latchmember ensginss'aid latching face and normally holding said cam inposition to open said valve, vents for incoming and outgoing air ilersaid oven.' closures for said vents, linkages-connecting' said ,'cam andsaid closures to holdthe same 'in open position, means I on the forwardend vof lsaid cani-steml accessible from the front'of the stove forrotating the same to open said valve andvents, a, clock mechanismmounted on the rear of said stove and having a control member accessiblefrom the front thereof, and a connection between said clock mechanismand said latch 'member for tripping the same to close said valve-andvents.

6. In a gas cook stove.,the sub-combination of an oven, a shutoff valvehaving a' valve stem biased to shutoi position, a cam having a faceengageable with said valve stem to move the same to open position andhaving a latching face, a cam stem on which said cam is mounted, biasingmeans urging said cam toward valve closing position, a latch memberengaging said latching face and normally holding said cam in position toopen said valve. vents for incoming and outgoing air for said ovenIclosures for said vents, linkages connecting said cam and said closurestol hold the same in open position, a bracket, said valve, cam stem andlatch member being supported on said bracket as a unitary assemblyattachable as a unit to said stove with said cam stem accessible fromthe front of said stove, means on the forward end of said cam stem forrotating the same to open said valve and vents, and means for trippingsaid latch `member to close the same.

7. In a gas cook stove, the sub-combination including an oven, a shutoffvalve having a valve stem biased to shutoff position, a cam having aface engageable with said valve stem to move the same to open positionand having a latching face, a cam -stern on which said cam is mounted,biasing means urging said cam toward valve closing position, a latchmember engaging said latching face and normally holding said cam inposition to open said valve, vents for' incoming andoutgoing air forsaid oven, closures for said' vents, linkages connecting said cam andsaid closures to hold the same in open position, a thermostatic valveoperated in response to oven temperature and having a temperaturesetting member, a bracket, said valves, cam stem and latch member beingsupported on said bracket as a unitary assembly attachable as a unit tosaid stove with the forward end of said `cam stem and the temperaturesetting member accessible from the front thereof, means on the forwardend of said cam stem for rotating the same to open said valve and vents,

valves in series.

means for tripping said latch member to close the same, a gas connectionbetween said valves, inlet and outlet gas connections, and ttings onsaid valves for detachably connecting said inlet connection to one ofsaid valves and said outlet connection to the other to pass gas throughsaid 8. In a gas cook stove having a cooking top, burners, and abackrail projecting upwardly adjacent the rear edge of the cooking top,the combination of a gas manifold having a horizontal run extendingalong the rear face of said backrail and a substantially vertical runextending downwardly from said horizontal run, `burner valves carried bythe'horizontal run of said manifold, control members for said burnervalves accessible from the front of said backrail and connected to saidvalves through loosely fitting openings in said backrail, studs securedto the horizontal run of said manifold and extending through looselytting openings in said backrau, lock nuts carried by said studs andadapted to engage the front and rear surfaces of said backrail to securesaid manifold thereto, means for securing said vertical run to a rearportion of the stove. said means being horizontally adjustable to adjustthe angular position of said manifold, valves and valve control memberswithv respect to said backrail before said lock nuts are tightened,whereby said lock nuts when tightened maintain said manifold in adjustedposition, and pipe connections between said valves and said burners.

\ 9. In a gas cook stove a front element having` apertures therein, thecombination of a unitary sub-assembly including a base adapted forconnection to the stove in iuxtaposition to the element and rearwardlythereof for concealment thereby, a shut-01T valve carried by the base',control mechanism for opening said valve and latching same in openposition, a thermostatic valve carried by the base, a control membertherefor, and means connecting in series the base carried valves forpassing gas therethrough, said control member and control mechanismhaving portions registering with the apertures for accessibility of saidportions from the front element and independent thereof when the base isconnected to the stove.

10. A stove as dened by claim 9, characterized by the addition of aclock mechanism for closing the shut-off valve and mounted upon the rearof said front element and having a manual control element extendingthrough an aperture thereof, and means detachably connecting said clockmechanism to theshut-off valvecontrol mechanism for clock mechanismoperation of the shut-off valve.

ALVIN G. SHERMAN.

